2x glock 19 or 17.
2x FNH 9mm
What are you looking for as far as capacity, size, quality... etc... a pair of kel-tec PF9 would be around $500 but you only have small capacity... but good concealing size... if you're OCing, I"d go with the glocks... you can't lose on those.
XD or XDsc is a good sized and affordable firearm too...